package Unknown;

public class Solution {

    public int firstUniqChar(String s){

        int[] freq = new int[26];

        for(int i = 0; i < s.length(); i++)
            freq[s.charAt(i) - 'a'] ++;

        for(int i = 0; i < s.length(); i++)
            if(freq[s.charAt(i) - 'a'] == 1)
                return i;
        return -1;
    }
}
